3969621 has 16 divisors (see below), whose sum is σ = 5915520. Its totient is φ = 2630880.

The previous prime is 3969611. The next prime is 3969629. The reversal of 3969621 is 1269693.

3969621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3969621 - 2⁶ = 3969557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3969629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5976 + ... + 6606.

It is an arithmetic number, because the mean of its divisors is an integer number (369720).

Almost surely, 2^3969621 is an apocalyptic number.

It is an amenable number.

3969621 is a deficient number, since it is larger than the sum of its proper divisors (1945899).

3969621 is a wasteful number, since it uses less digits than its factorization.

3969621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873 (or 867 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 3969621 is about 1992.3907749234. The cubic root of 3969621 is about 158.3372197261.

The spelling of 3969621 in words is "three million, nine hundred sixty-nine thousand, six hundred twenty-one".